Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a994f1d752cfe0…

MALICIOUS

PDF

66.4 KB Created: 2021-05-31 13:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99b0b7432512574db00653f8bef161d8 SHA-1: 7a6f33055c2483e25e40355ed388e4abab71cb85 SHA-256: 20a994f1d752cfe0b81cf85751f994c976db10e74315768011fa03060f7b7343
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, likely used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=industrial+craft+2+1+7+10 PDF link annotation
    • https://vokufasel.weebly.com/uploads/1/3/4/8/134872836/f228d5ef.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/dd1b460ea2c7b8.pdfIn PDF document text
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/018a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_6050397543ce0.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/perinatatalinemero.pdfIn PDF document text
    • https://mebuduwo.weebly.com/uploads/1/3/1/4/131453299/10788e1387a3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486983/normal_60b10ee565772.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/mavevezumafamofewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/319a357e-80ea-4afe-99c9-20f69376d318/6298731865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2007db-fb77-46f7-94e8-71f6fa1bd5d6/21504344686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea2bb40-d810-4a8c-9616-9e80119c3d24/fireve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2cf8a2-bc59-4107-83af-bad47209f725/rumilorivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5df7f66-bb68-4e44-b412-209a27ab2745/45646761230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d655ec21-b86c-4f5f-9f02-dee3abd34632/24262074777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d369e083-23bf-4603-91ae-c91ec46c36ac/can_you_add_a_tooth_to_a_partial_denture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29872b45-fa1d-46dc-b2cd-4ea9feee2c62/suzagewog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c97d12f-41fd-45b6-97ca-011e28ad4466/latitude_e6410_drivers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 5356 bytes
SHA-256: f02158b5de6b34994e439f30367ff57bb49cd55e7832e82a65fb69cb1b9597ef
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 10048 bytes
SHA-256: 95b600519054683dfdb96db4f795dada4b6d4af0f93897171f18c1c5678b0950

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